class_docstr: Reader for the OSISAF l3 netCDF format.
class_docstr_tok: ["Reader","for","the","OSISAF","l3","netCDF","format","."]
docstr: Get the start time.
docstr_tok: ["Get","the","start","time","."]
code: def start_time(self):
      """Get the start time."""
      poss_names = [
          "/attr/start_date",
          "/attr/start_time",
          "/attr/time_coverage_start",
      ]
      for name in poss_names:
          start_t = self.get(name)
          if start_t is not None:
              break
      if start_t is None:
          raise ValueError("Unknown start time attribute.")
      return self._parse_datetime(start_t)
  
file_path: satpy/satpy/readers/osisaf_l3_nc.py
imports: import logging
  from datetime import datetime
  from satpy.readers.netcdf_utils import NetCDF4FileHandler
label_desc: Use image node_id 12 for calling the OSISAFL3NCFileHandler obj's underlying member method code with example usage: obj.start_time() and returns: self